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Finding the Fourth Proportional to 1,210.94, 1,671.30 and 686.87

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Solution

The fourth proportional to 1,210.94, 1,671.30 and 686.87 is: 948.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.94 : 1,671.30 = 686.87 : x
  2. Step 2: Convert to fraction form
    1,210.94/1,671.30 = 686.87/x
  3. Step 3: Cross multiply
    1,210.94x = 1,671.30 × 686.87
  4. Step 4: Simplify right side
    1,210.94x = 1,147,965.83
  5. Step 5: Solve for x
    x = 1,147,965.83/1,210.94
  6. Step 6: Final answer
    x = 948.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.